Abstract: In view of problem that moisture control process of coal moisture equipment of vertical composite-bed needs real-time monitoring and control, a monitoring system of coal moisture control of vertical composite-bed was designed. Functions and three-layer network structure of the system were given according to process and characteristics of coal moisture equipment, design of hardware and monitoring picture of upper-computer of the system were introduced in details. The actual application showed that the system ensures stable and safe running of coal moisture equipment and provides intuitive monitoring mode for field personnel.